.bi-wrapper {
    position: fixed;
    z-index: 100;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 280px;
    background-color: #333;
}
.bi-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 20px;
    height: 20px;
    background: url(./close.png) no-repeat 3px 3px;
    cursor: pointer;
}
.bi-upload-btn {
    position: relative;
    width: 260px;
    height: 140px;
    margin: 70px auto 0 auto;
    border: 2px dashed #a0a0a0;
    border-radius: 10px;
    background: url(./uploader.png) no-repeat center center;
}
.bi-upload-btn:hover {
    border-color: #fff;
}
.bi-upload-file {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}
.bi-canvas {
    position: relative;
    width: 1000px;
    height: 220px;
    margin: 30px auto 0 auto;
    background-color: #000;
}
.bi-btn {
    position: absolute;
    bottom: 0;
    right: -90px;
    display: inline-block;
    box-sizing: border-box;
    width: 80px;
    height: 34px;
    line-height: 32px;
    font-size: 14px;
    color: #fff;
    text-align: center;
    cursor: pointer;
    border: 1px solid #7fbbe2;
    background-color: #7fbbe2;
    outline: 0;
    border-radius: 4px;
}
.bi-btn-dander {
    bottom: 50px;
    background-color: #efadab;
    border-color: #efadab;
}
